summing amplifier

例句：

1. 1. The electronic device is designed to improve the signal-to-noise ratio of the input signal.
   这个电子设备的设计目的是提高输入信号的信噪比。
2. 2.In this experiment, we used a summing amplifier to amplify the weak signal.
   在这个实验中，我们使用了求和放大器来放大微弱的信号。
3. 3. The summing amplifier was responsible for amplifying the audio signals from the microphones.
   求和放大器负责放大麦克风传来的音频信号。